Illuminating device



Oct. 25, 1932. M. ADAMS E1- AL 1,884,957

' ILLUMINTING DEVICE Filed Aug. 4. 1931 1 I BY/w ATTQRNEYS E@ l- M MPatented Oct. 25, 1932 UNrrED STATESv PATENT OFFICE MAUDEADAMSANDVBLAYMOND F. HOWE, OF NEW YORK, N. Y., AND PERLEY G. N UTTING,

` OF WASHINGTON, DISTRICT OF COLUMBIA ILLUMINATING DEVICE Applicationled August 4, 1931.

This invention relates to lamp structures, and with particularity tolamps of the highpowered type. Y,

An object of the invention is to provide a high-powered incandescentlamp which is etiicient in use, and which is of rugged construction.

A feature of the invention resides in the methods and means forsupporting the turns of a relatively heavy coiled filament'againstsagging, and also means for supporting the filament assembly as a whole.

A further feature of the invention relates to a high-powered lampemploying a long coiled filament, having means for supporting thefilament at opposite ends and also at its vcentral portion.

A still further feature relates to the details of construct-ion which goto make up a commercially practicable high-powered'lamp.

While the advantages of the invention find their greatest application inlamps of 10 or more kilowatts capacity, it will be understood that theinvention is capable of embodiment in smaller size lamps.

Other features and advantages not specifically enumerated will beapparent after a consideration of the following detailed descriptionsand the appended claims.

Referring to the drawing:

Fig. 1 shows a portion of a lamp according to the invention.

Fig. 2 is a detailed view showing one of the side supports for thefilament.

Fig. 3 is a. detailed view showing the arrangement of the lead-in wires.

Fig. 4 is a detailed view of one of the anchoring members for the lowerportion of the filament.

Fig. 5 is a detailed View showing the manner of uniting the upper endsof the side supports.

Figp is a sectional view taken along the line 6-6 of Fig. 1.

Referring more particularly to Fig. 1 there is shown a high poweredincandescent lamp of the type disclosed in the co-pending application ofRaymond Howe Serial No. 362,977 tiled May 14, 1929. This lamp comprisesan evacuated envelope 1 which may be of any Serial No. 555,004.

desired shape preferably altho not necessarily cylindrical or spherical.The material'of the envelope is preferably altho not necessarily, of'high heat resistant material such as Pyrex glass or the like. Theenvelope 1 terminates at its lower end in a re-entrant portion 2 throughwhich pass the four lead-in wires 3, 4, 5, 6. The wires or rods 5 and 6converge towards each other and cross at the point 7 as indicated inFig. 2. At this point w the wires may be welded or otherwise fastenedtogether in any suitable manner. After crossing each other the wires 5and 6 continue upwardly and preferably, altho not necessarily, thesewires are bowed outwardly 55 from each other to provide a frame. Wires 5and 6 again cross each other at their upper ends, and one of these wiresfor example the wire 6, is twisted around the wire 5 at which point thewires may again be welded or other- 7o wise fastened together. The wire5 however is bent at right angles to itself and its end is hooked asindicated by the numeral 8 Fig. 5. The other pair of wires 3 and 4 arebent in the same manner as the wires 5 and 6 and 75 thus provide a framesupport similar to the said wires 5, 6. The hooked ends 8 of the wires 4and 5 are embedded in ay block of insulation 9 such as zirconia or thelike. The block 9 therefore forms a tie member for the 80 upper ends ofthe frame members. Extending across the wires 5, 6, is a rod 10 which isof heat resistant metal such as tungsten molybdenum or the like, the rod10 is preferably welded or otherwise fastened to the 35 wires 5, 6. Asimilar rod 11 extends across the wires 3, 4.

Supported by the members 10, 11 is a block of insulation material 12preferably, although not necessarily of zirconia or other heat resistantmaterial. Supported by the insulation block 9 are two filamentsupporting hooks 13, 14. These hooks are preferably made out of stripmetal such as tungsten or molybdenum and are wrapped around the block 9as shown in the drawing (Fig. 1). Supported by the lower block 12 arethree filament anchoring members 15, 16 and 17 which likewise may bemade out of strip metal and surround the said block 12, as shown '10o 16and 17 may be. made with the ends overlapped so as to 'enable thefilament portion 18 to be expeditiously assembled and also to revent thefilament slipping out -of the anclioring member. The filament proper ispreferably in the form of a closely wound wire helix of tungsten orother similar metal, and comprises a series of similar sectionspreferably, altho not necessarily, connected in series. The free endsofthe coiled filament are connected to the members 20 and 21 whichlatter members are similar to the members 10 and 11. Preferably also theends of the filament are welded tothe members 20 and 21 thus insuringadequate support for the end sections of the filament. The intermediatesections ofsthe filament are supported mainly, altho not entirely by themembers 13 and 14.

Attached to the wires 3 and 6 is a block 22 of insulation such aszirconia orv the like. This block carries a` series of metal projections23 which are adapted to be fastened to the respective sections of thecoiled filament, it being understood that there is provided one of theprojections 23 for each section of the filament. Preferably the members23 are welded to the middle turn of each of the associated filamentcoils, thus insuring that the middle portion of the whole filament isadequately supported.

In many cases the lamp is required to be used in a non-vertical positionand it has been found that unless special precautions are taken thefilament assembly because of its weight, and also because of incidentaljars or vibrations, many times becomes loose and breaks the portions ofthe envelope where the wires 3, 4, 5 and 6 are scaled in. For thepurpose of preventing this happening the upper end of the filamentassembly is supported from the upper end of the lamp envelope. As showninthe drawing the insulation block 9 carries a pair of uprights 24 and25 which may be of tungsten, molybdenum or other similar metal. Each ofthe uprights may be in the form of a strip of metal wrapped around theblock 9 as indicated in Fig. 1a. Fastened to the upper ends of theuprights 24 and 25 is a collar 26 also 'of heat resistant material suchas tungsten, molybdenum or the like. Preferably the member 26 is weldedto the uprights 24 and 25.

As will be seen from an inspection of Fig. 1, the lamp envelope 1 isprovided with a rectangular constricted portion 27 to receive the member26 and for` this purpose the portion 27 is of slightly larger dimensionsthan the said member 26 to allow for the normal expansions andcontractions thereof. However the member 26 through the intermediary ofmembers 24, 25 and 9 eifectually limits the extent to which the filamentassembly as a whole may tilt. Consequently the lalnp may be used in ahorizontal position without there being anyl dangery of the filament andits assembly breaking Vthe glass at the seal-in.

When the lamp is to be used with a plug in socket the lower constrictedendof the envelope is provided with a suitabl'ebase 28 in the form of ametal cap or cup through which the wires 3, 4, 5 and 6 pass.V The base29 of the cap 28 is preferably of insulation solas to preventshort-eircuiting.

If desired the basev28 may be made entirely out of'insulating materialsuch for `example as is the common practice in the radio tube art.However in the easeof high-powered lamps it is necessary to provide abase which has a certain amount of flexibility.. For this purpose thebase portion 28 may be further enclosed in a metal member 30 the lower`portion of which is in the form of a cup surrounding the base 28. 0fcourse the bottom of the member 30-is perforated to allow the wires 3,4, 5 and 6 to pass therethrough. Preferably also the perforations in thebottom of member 30 are considerably larger than the diameter of thewire so as to preclude short-circuiting. In order that the wires may beheld in place properly, the lower ends thereof may be threaded andfastened in place with suitable locknuts 32. The upper portion of themember 30 is in the form of two partially overlapping fingers 33 whichlsurround the base 28, but allow the lamp as a whole to tilt slightlywith respect to the base or receptacle into which the lamp is plugged.

For detailed descriptions 'of the separate features disclosed in thedrawing reference maybe made to the copending applications of RaymondHowe Serial No. 362,977 iiled Maj,y 14. 1929; Raymond F. Howe Serial No.543,034 filed June 9, 1931; Maude Adams` Raymond F. Howe-Perley G.Nutting, Serial No. 549,660 filed June 9, 1931. However it is understoodthat various modifications may be made without departing from the spiritand scope of the invention.

What is claimed is:

1. A high-powered lamp comprising an evacuated envelope,.an incandescentmember in the form of a coiled filament having a plurality of sectionsarranged in parallel rows, means for supporting all said sections fromboth ends of the envelope, and means forl supporting each sectionintermediate its enc s.

2. A lamp according to claim 1 in which the iila ment sections are insubstantially the same plane, and the means for supporting the filamentincludes a pair of frame members arising' from one end of the envelope,and a member adapted to engage the opposite end of the envelope to limitthe tilting movement of said frame members.

3. A high-powered lamp having an evacuated envelope, a pair of framemembers arising from one end of the envelope, a pair of insulation framemembers extending across said first-mentioned members, a filament in theform of a plurality of coil sections arranged in parallel rows, saidfilament being supported by said frame members, a projection from theupper one of said insulation members and adapted to engage the upper endof the envelope to limit the tilting movement of the filament as awhole, and means engaging each section of the filament intermediate itsends to prevent sagging within the filament'.

4. A lamp according to claim 3 in which each of the first-mentionedframe members consists of a pair of crossed wires of heat resistantmaterial.

5. A lamp according to claim 3 in which each of said insulation membersis of zirconia.

(i. A lamp according to claim 3 in which upper end of the envelope isprovided 'with a constricted portion to receive said projection.

7. A high-powered lamp comprising an evacuated envelope having a lowerre-entrant portion and an upper constricted portion, a pair of uprightssealed into said re-entrant portion, a sectional coiled' filamentadapted to be supported by said uprights, the electrical ends of saidfilament being welded to said uprights, a pair of insulation tie membersextending across said uprights, a pair of hooks carried by each tiemember for engaging the lilament at opposite ends to allow the lilamentto expand and contract and' at the same time supporting the iilamentagainst collapsing, a third tie member of insulation extending acrosssaid uprights adjacent the center part of the filament, means foranchoring the central part of each filament section to said third tiemember, and means carried by the uppermost one of said pair of tiemembers and adapted to engage the constricted end of the envelope tolimit the tilting of the filament as a whole.

In testimony whereof I have hereunto set my hand on this 23rd day ofJuly A. D., 1931.

MAUDE ADAMS. RAYMOND F. HOWE. ln testimony whereof I have hereunto setmylhand on this 1st day of August A. D.,

PERLEY G. NUTTING.

